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+--- Thread: Lucas Advance Switch (/showthread.php?tid=36505)
Lucas Advance Switch - RAW - 15-12-2017
Hi all,
Having some misfiring at start up in the cold weather as the cold start system doesn’t function. Fitted a brand new wax stat which has the cold start cable moving properly which has improved things slightly, but the advance switch is also faulty. Can’t seem to find a part number for it anywhere or anyone trying to sell them. Does anyone have any ideas where o might get one or what the part number is?
Cheers,
Rich
RE: Lucas Advance Switch - andywhy - 20-12-2017
Misfiring is more likely bad glow plug(s).
RE: Lucas Advance Switch - RAW - 10-03-2018
I’d agree if I hadn’t fitted a set of genuine Bosch ones about 12 months ago. Suppose I better test them just in case but I’m confident it’s not advancing the injection.
Rich
RE: Lucas Advance Switch - Martin306 - 11-03-2018
It doesn't even advance the pump that much, it shouldn't be misfiring for any length of time when cold once it's started.
Glow plugs can fail at any time regardless of the brand. I've fitted Beru, NGK, Bosch, Denso, and they're all as shit as each other.
When you say the "system" isn't working what exactly do to you mean? If it thinks the engine is warm it will be turning the glow plugs off right after starting. They should get a constant 12v for 3-4 minutes after the engine is started and running. It's more likely the reason why it runs lumpy rather than your advance. Should be easy to check there is a 12v feed with a multimeter on the glow plug loom.
RE: Lucas Advance Switch - pug_345 - 11-03-2018
Im having same problem 2 sets of glow plugs and a used working relay unit still does it
RE: Lucas Advance Switch - pug_345 - 12-03-2018
Done mine was the cold start switch
RE: Lucas Advance Switch - RAW - 22-03-2018
Does seem like the Lucas pumps on the XUD advance a lot less when cold than Bosch pumps on VW engines - no idea why. After more testing it seems like the advance solenoid is clicking when the switch is closed, so the switch seems to be working. Cold start advance thermostat is new and working well so I’m going to have a close look at the glow plugs and if it’s not then then I think I need to work out if the solenoid is actually moving.
Rich
RE: Lucas Advance Switch - Martin306 - 23-03-2018
(22-03-2018, 08:32 PM)RAW Wrote: Does seem like the Lucas pumps on the XUD advance a lot less when cold than Bosch pumps on VW engines - no idea why. After more testing it seems like the advance solenoid is clicking when the switch is closed, so the switch seems to be working. Cold start advance thermostat is new and working well so I’m going to have a close look at the glow plugs and if it’s not then then I think I need to work out if the solenoid is actually moving.
Rich
Mind the old golf diesels used to have a manual advance on them!
just hooked it up to a "choke" lever.
RE: Lucas Advance Switch - RAW - 30-03-2018
Thermostatically actuated on the posh six pots in the volvo
thermostats often fail though hence it was the first thing I suspected on the pug. I was right but it doesn’t seem to be the whole problem. Rich